Hybrid tea rose plant named `JACpow`

ABSTRACT

A hybrid tea class rose plant having a vigorous, upright growth; good production as a greenhouse cut flower; long, straight stems; attractive white-with-delicate-pink-blush flower and quick cycle time.

The present invention relates to a new and distinct variety of roseplant of the Hybrid Tea class which was originated by me by crossing thevariety JAChop, U.S. Plant Pat. No. 6,653, with the variety KORflug,U.S. Plant Pat. No. 5,575.

The primary objective of this breeding was to produce a new rose varietyhaving the high production and fast cycle time of JAChop combined withthe light pink color and flower size of KORflug. The objective wassubstantially achieved along with other desirable improvements asevidenced by the following unique combination of characteristics whichare outstanding in the new variety and which distinguish it from itsparents, as well as from all other varieties of which I am aware:

1. Good production (200 stems per m²) for a large-flowered greenhousecut flower rose;

2. Quick cycle time for a large-flowered rose;

3. An attractive white rose with a delicate pink blush;

4. Long, straight stems;

5. Vigorous, upright growth.

Asexual reproduction of this new variety by budding, as performed atWasco, Calif., shows that the foregoing characteristics and distinctionscome true to form and are established and transmitted through succeedingpropagations.

The accompanying illustration shows typical specimens of the vegetativegrowth and flowers of this new variety in different stages ofdevelopment, depicted in color as nearly true as it is reasonablypossible to make the same in a color illustration of this character.

The following is a detailed description of my new rose cultivar withcolor descriptions using terminology in accordance with The RoyalHorticultural Society (London) Colour Chart, except where ordinarydictionary significance of color is indicated.

Parentage:

Seed parent.--JAChop, U.S. Plant Pat. No. 6,653.

Pollen parent.--KORflug, U.S. Plant Pat. No. 5,575.

Classification:

Botanical.--Rosa hybrida.

Commercial.--Hybrid Tea.

FLOWER

Observations made from specimens grown in a greenhouse environment inSomis, Calif., from Jan. through Jun., 1992.

Blooming habit: Recurrent. Cycle time is generally one week faster thanother hybrid tea cut roses of the color range.

Bud:

Size.--13/4" when the petals start to unfurl.

Form.--Long, pointed, ovoid.

Color.--When sepals first divide, bud color is Yellow White Group 158Dwith a distinct line of Red Group 46D on the petal edges. When halfblown, the upper and lower sides of the petals are White Group 155B withpetal edges being Red Group 49B. The Red Group 49B gradually spreadsacross the petals as the flower opens.

Sepals.--Color: Green Group 138B. Surface texture: Covered with finehairs. There are three normally appendaged sepals. There are twounappendaged sepals with hairy edges.

Receptacle.--Color: Green Group 137C. Shape: Apple. Size: Large,7/16"×7/16". Surface: Smooth.

Peduncle.--Length: Long, 4". Surface: Smooth with occasional glands.Color: Medium green. Strength: Stiff, erect.

Bloom:

Size.--Large. Average open size is 5".

Borne.--Singly.

Stems.--Long, strong, 24" to 28".

Form.--When first open: High centered. Permanence: Outer petals curlback.

Petalage.--Number of petals under normal conditions: 35.

Color.--The upper and reverse sides of the petals are White Group 155Bwith Red Group 49B on the petal edges. The Red Group 49B graduallyspreads across the petals as the flower opens. The bases of the petalshave a small (1/8×1/8"), greenish white half moon at the point ofattachment. The major color on the upper side is White Group 155B.

Variegations.--None.

Discoloration.--No change in general tonality at the end of the firstday. By the end of the third day: A gradual spreading of Red Group 49Bover the petal surface occurs.

Fragrance.--Slight.

Petals:

Texture.--Thick.

Shape.--Round.

Form.--Tips slightly recurved.

Arrangement.--Imbricated, with few petaloids in the center.

Persistence.--Drop off cleanly.

Lastingness.--On the plant: Long, 5 to 6 days. As a cut flower: Long, 7to 8 days.

Reproductive parts:

Anthers.--Size: Medium. Quantity: Many. Color: Yellow. Arrangement:Regular around the styles.

Filaments.--Color: White.

Pollen.--Color: Lemon yellow.

Styles.--Color: Yellow.

Stigmas.--Color: Greenish white.

Form: Bush.

Growth: Vigorous, upright and branching.

Foliage: Number of leaflets on normal mid-stem leaves: 5.

Size.--Large, 6"×4".

Quantity.--Normal.

Color.--New foliage: Light green. Old foliage: Dark green.

Leaflets:

Shape.--Pointed oval.

Texture.--Upper side: Smooth.

Edge.--Serrated.

Serration.--Single, small.

Petiole rachis.--Color: Green with some reddish cast.

Petiole underside.--Smooth with occasional prickles.

Stipules.--Short, bearded and edged with glands.

Disease resistance.--Susceptible to mildew under normal growingconditions in a greenhouse environment at Somis, Calif.

Wood:

New wood.--Color: Light green. Bark: Smooth.

Old wood.--Color: Green. Bark: Smooth.

Prickles:

Quantity.--On main canes from base: Ordinary. On laterals from maincanes: Ordinary.

Form.--Medium, hooked downward.

Color when young.--Red.

Small prickles:

Quantity.--On main stalks: None. On laterals: None.

I claim:
 1. A new and distinct variety of rose plant of the hybrid teaclass, substantially as herein shown and described, characterizedparticularly as to novelty by the unique combination of its vigorousupright growth, its good production as a greenhouse cut flower, its longstraight stems, and its attractive white-with-delicate-pink-blush flowerand quick cycle time.